Slip Yoke Eliminator Kit
A Slip Yoke Eliminator Kit will eliminate the need to drop your transfer case in order to avoid drivetrain vibrations that are caused by taller suspension lift kits. This kit is a must if you have installed a 2” or taller suspension Jeep in your 1987-2006 Wrangler (not needed for body lifted Jeeps). The kit fits all newer production NP 231 transfer cases (1988 up). The purpose of this kit is to replace the slip yoke portion of the 
NP231 with a fixed-yoke, CV style drive shaft assembly. This is the most complete and strongest kit available on the market today. Check out the size and thickness of the output shaft housing. NOTE: A CV equipped drive shaft will be required for this conversion kit.
NP231 with a fixed-yoke, CV style drive shaft assembly. This is the most complete and strongest kit available on the market today. Check out the size and thickness of the output shaft housing. NOTE: A CV equipped drive shaft will be required for this conversion kit.
Eliminate problems with your NP231 transfer case. We are proud to offer quality professional slip yoke eleminator components and driveshafts. We aslo offer rebuilt NP231 transfer cases and parts including transfer case parts kits that are designed to be top of the line overhaul kits. The New Process 231 series transfer case started to be installed in Jeep, applications in 1987. These transfer cases are part time four wheel drive with shift positions 4HI - 2HI - N - 4L. The NP231 is 1:1 direct drive in high range, and use planetary reduction gears for low range with a ratio of 2.72:1. More information on the NP231.Got a lifted Jeep and have dredded driveline vibrations? Want to keep that skid plate tucked up? Install this Heavy Duty Slip Yoke Eliminator kit and take care of all that! We offer three different kits, the transfer eliminator kit, the transfer eliminator super short kit and the the transfer eliminator kit with a brand new driveshaft.
| Description | Part Number | Kit Contains |
Photo of Kit |
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Transfer Eliminator Kit
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OMI52231 | - Rear Output Housing w/ plug - Rear Output Bearing - Rear Output Seal - Rear Output Yoke and nut - Main Output Shaft - Speedometer Drive Gear - Snap Ring for Speedometer Gear-QTY: 2 - Rear Output Bearing Snap Ring - Snap Ring for Mode Gear - Front Output Spline Seal - Rear Output Spline Seal |
Click image to enlarge |
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Transfer Eliminator Mega Short kit
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OMI18676.72 | - Mega Short Output Shaft (1) - Output Yoke (1) - Magnetic Speed Sensor (1) - Speed Sensor Retainer Bolt (1) - Output Yoke UNF Flat Washers (4) - Tone Ring w/Oiling Holes(1) - Mega Short Outpput Shaft Housing with Pre-installed Seal, Bearing and C-clip Ring(1) - Output Yoke UNF 12 Point Bolts (4) - Output Yoke Retainer Nut (1) - Speed Sensor Retainer Bolt w/Washer(1) |
Click image to enlarge |
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Transfer eliminator kit with new driveshaft
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OMI52231Shaft | - New Custom Built CV Style Driveshaft with Long Slip n Stub - Rear Output Housing w/ plug - Rear Output Bearing - Rear Output Bearing - Rear Output Yoke and nNut - Main Output Shaft - Speedometer Drive Gear - Snap Ring for Speedometer Gear-QTY: 2 - Rear Output Bearing Snap Ring - Snap Ring for Mode Gear - Front Output Spline Seal - Rear Output Spline Seal |
Click image to enlarge |
APPLICATIONS :
This kit will reduce your tailshaft length by about 6.5" on 1997-2006 TJ Wranglers and by about 4.25" on 1988-1995 YJ Wranglers, which translates to lower rear driveshaft angles. This kit will also work on XJ Cherokees with the NP231 transfer case.
This kit will reduce your tailshaft length by about 6.5" on 1997-2006 TJ Wranglers and by about 4.25" on 1988-1995 YJ Wranglers, which translates to lower rear driveshaft angles. This kit will also work on XJ Cherokees with the NP231 transfer case.
This kit comes with a heavy-duty rear output shaft which has a larger spline diameter and is stronger than than a weak stock shaft. A new aluminum tailshaft housing, bearings, seals, snap rings, speedo drive gear, and instructions are also included. Some models may require shortening the transfer case mode shift rail.
A new cv-style rear driveshaft will be required after installation of this kit. We can supply this custom built CV Shaft for $199.00
NOTE: Some early NP231 produced from 1987 – 1990 have the vacuum switch for the front axle disconnect housed in the rear output shaft housing. This kit is supplied with a new housing that does not allow for the vacuum switch to be reused for this applications. It will be necessary to purchase a cable operated disconnect manufactured by 4x4 Posi-Lock or replace the front passenger side axles with later solid axle shafts.
A new cv-style rear driveshaft will be required after installation of this kit. We can supply this custom built CV Shaft for $199.00
NOTE: Some early NP231 produced from 1987 – 1990 have the vacuum switch for the front axle disconnect housed in the rear output shaft housing. This kit is supplied with a new housing that does not allow for the vacuum switch to be reused for this applications. It will be necessary to purchase a cable operated disconnect manufactured by 4x4 Posi-Lock or replace the front passenger side axles with later solid axle shafts.
The 18676.72 kit has been designed to work with all Wranglers and XJ Cherokees with an electronic speedometer and a factory installed NP231-J transfer case. Any vehicle manufactured prior to 1992 will need to be retro fitted with an electronic speedometer (will not work with cable driven speedometers)
APPLICATION NOTES: (1) Some early NP231 produced from 1987 – 1990 have the vacuum switch for the front axle disconnect located in the rear output shaft housing. This kit is supplied with a new housing that does not allow for the vacuum switch to be reused for this applications. It will be necessary to purchase a cable operated disconnect manufactured by 4x4 Posi-Lock or replace the front passenger side axles with later solid axle shafts. (2) Some 1998 and older model Jeeps will have a different three wire connecter than what is supplied with this kit. If this is the case you will need to hard wire the leads to eliminate the connector all together. Wire color codes and instructions are included later in the instructions (3) This kit will not work on 2007 and newer JK’s (4) This kit will not work on TJ Rubicon’s or Rubicon Unlimited. (5) Proper calibration of speedometer may be needed after installation. See chart supplied with instructions for further information. The purpose of this kit is to replace the slip yoke portion of the NP231 with a fixed-yoke, CV-style drive shaft assembly. A CV equipped drive shaft will be required with this conversion kit. The stock drive shaft can be modified to work. Proper length and balance are critical. High –quality drive shafts in the required lengths and configurations are available to compliment this kit for many applications. The easiest way to install this kit is to remove the transfer case from your Jeep. Removal is not necessary, but usually is much quicker and easier and highly recommended. The installation of this kit requires almost total disassembly of your transfer case.
This kit comes with a heavy-duty rear output shaft which has a larger spline diameter and is stronger than the stock shaft. A new aluminum tailshaft housing, bearings, seals, snap rings, speedo drive gear, and instructions are also included. Some models may require shortening the transfer case mode shift rail.
You will receive a Brand New CV Driveshaft. The Driveshaft comes with a Long Slip n Stub, with Top of the line greaseable U-joints and a greaseable CV Kit. This Driveshaft is Dynamically Balance to High Speeds. When you buy this kit we will send you the SYE Kit first then you install it. Give us the measurement for the driveshaft when you are ready and we make it up that same day and ship it out. We feel this is the best way, you know this shaft will fit your jeep perfect, because it is custom made to fit your Jeep, and there is no guessing. Life time warranty on all welds, and if you twist the tube.
NOTE: Some early NP231 produced from 1987 – 1990 have the vacuum switch for the front axle disconnect housed in the rear output shaft housing. This kit is supplied with a new housing that does not allow for the vacuum switch to be reused for this applications. It will be necessary to purchase a cable operated disconnect manufactured by 4x4 Posi-Lock (we sell this item in our ebay store) or replace the front passenger side axles with later solid axle shafts.
You will receive a Brand New CV Driveshaft. The Driveshaft comes with a Long Slip n Stub, with Top of the line greaseable U-joints and a greaseable CV Kit. This Driveshaft is Dynamically Balance to High Speeds. When you buy this kit we will send you the SYE Kit first then you install it. Give us the measurement for the driveshaft when you are ready and we make it up that same day and ship it out. We feel this is the best way, you know this shaft will fit your jeep perfect, because it is custom made to fit your Jeep, and there is no guessing. Life time warranty on all welds, and if you twist the tube.
NOTE: Some early NP231 produced from 1987 – 1990 have the vacuum switch for the front axle disconnect housed in the rear output shaft housing. This kit is supplied with a new housing that does not allow for the vacuum switch to be reused for this applications. It will be necessary to purchase a cable operated disconnect manufactured by 4x4 Posi-Lock (we sell this item in our ebay store) or replace the front passenger side axles with later solid axle shafts.
APPLICATIONS :
This kit will reduce your tailshaft length by about 6.5" on 1997-2006 TJ Wranglers and by about 4.25" on 1988-1995 YJ Wranglers, which translates to lower rear driveshaft angles. This kit will also work on XJ Cherokees with the NP231 transfer case.
This kit will reduce your tailshaft length by about 6.5" on 1997-2006 TJ Wranglers and by about 4.25" on 1988-1995 YJ Wranglers, which translates to lower rear driveshaft angles. This kit will also work on XJ Cherokees with the NP231 transfer case.
This unit is chain driven front output, left hand drop (front drive shaft on driver's side) on the Jeep. The 231 are a light 
duty transfer case typically used in 4 and 6 cylinder Jeep applications. These New Process cases have a circular tag on the rear of the case, near the center close to where the rear drive shaft exits. Identification information for the NP231 transfer case is on this tag typically includes model number, assembly number, and serial number and ratio data. When ordering a replacement transfer case it's most important to provide the assembly number. This number is typically eight digits, four number a rivet/screw head and four additional numbers.
Jeep, versions all use a 6-bolt circular bolt pattern. This pattern is non-symmetrical and will only bolt up one way. Jeep units and Dodge units are general interchangeable, however Chevrolet units are not. While GM uses the same 6-bolt patter, they have it rotate approximately 90 degrees from that used by Jeep or Dodge.
NP231 transfer cases come with either a 21 or 23 spline female input. The 21 spline shaft is frequently found in 4 cylinder applications and the 2.8L V6, While 4.0L 6 cylinder and 8 cylinder applications always used the 23 spline input shaft.
duty transfer case typically used in 4 and 6 cylinder Jeep applications. These New Process cases have a circular tag on the rear of the case, near the center close to where the rear drive shaft exits. Identification information for the NP231 transfer case is on this tag typically includes model number, assembly number, and serial number and ratio data. When ordering a replacement transfer case it's most important to provide the assembly number. This number is typically eight digits, four number a rivet/screw head and four additional numbers.Jeep, versions all use a 6-bolt circular bolt pattern. This pattern is non-symmetrical and will only bolt up one way. Jeep units and Dodge units are general interchangeable, however Chevrolet units are not. While GM uses the same 6-bolt patter, they have it rotate approximately 90 degrees from that used by Jeep or Dodge.
NP231 transfer cases come with either a 21 or 23 spline female input. The 21 spline shaft is frequently found in 4 cylinder applications and the 2.8L V6, While 4.0L 6 cylinder and 8 cylinder applications always used the 23 spline input shaft.